Fix bug in constant folding.
Fix bug in constant folding.

Prevent lazy behavior of the all intrinsic.

hainm/pythran,serge-sans-paille/pythran,pombredanne/pythran,artas360/pythran,serge-sans-paille/pythran,pbrunet/pythran,hainm/pythran,pombredanne/pythran,artas360/pythran,pombredanne/pythran,hainm/pythran,pbrunet/pythran,pbrunet/pythran,artas360/pythran